EP0131643B1 - Polyetherimid-Polycarbonat-Mischungen - Google Patents

Polyetherimid-Polycarbonat-Mischungen Download PDF

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Publication number
EP0131643B1
EP0131643B1 EP83106942A EP83106942A EP0131643B1 EP 0131643 B1 EP0131643 B1 EP 0131643B1 EP 83106942 A EP83106942 A EP 83106942A EP 83106942 A EP83106942 A EP 83106942A EP 0131643 B1 EP0131643 B1 EP 0131643B1
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Prior art keywords
composition
accordance
bis
polycarbonate
polyetherimide
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EP83106942A
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English (en)
French (fr)
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EP0131643A1 (de
Inventor
Gary Andreas Mellinger
Harold Frazee Giles, Jr.
Fred Frank Holub
William Rudolph Schlich
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General Electric Co
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General Electric Co
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
    • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Definitions

  • This invention relates to a class of blends containing a polyetherimide and a thermoplastic polycarbonate.
  • the blends exhibit a higher heat distortion temperature, an improved flexural strength and tensile strength over the polycarbonate component alone and have a higher impact strength than that associated with the polyetherimide component of the blends.
  • the blends may exhibit good flame resistance.
  • the blends of the invention include a polyetherimide of the formula: where a represents a whole number in excess of 1, e.g., 10 to 10,000 or more, the group -0-A ⁇ is selected from: R' being hydrogen, lower alkyl or lower alkoxy, preferably the polyetherimide includes the latter-0-A ⁇ group where
  • Polycarbonates for use in the blends of the invention can be generally defined as high molecular weight, thermoplastic, aromatic polymers and include homopolycarbonates and copolycarbonates and mixtures thereof which have average molecular weights of about 8,000 to more than 200,000, preferably of about 20,000 to 80,000 and an I.V. of 0.40 to 1.0 dl/g as measured in methylene chloride at 25°C.
  • polycarbonates are derived from dihydric phenols and carbonate precursors and generally speaking, contain recurring structural units of the formula: where Y is a divalent aromaic residue of 2,2-bis(4-hydroxyphenyl)propane, bis(4-hydroxyphenyl) methane, 2,2-bis(4-hydroxy-3-methy)pheny))propane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane, and bis(3-chloro-4-hydroxyphenyl)methane.
  • Y is a divalent aromaic residue of 2,2-bis(4-hydroxyphenyl)propane, bis(4-hydroxyphenyl) methane, 2,2-bis(4-hydroxy-3-methy)pheny))propane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-
  • the carbonate precursor employed can be either a carbonyl halide, a carbonate ester or a haloformate.
  • the carbonyl halides which can be employed are carbonyl bromide, carbonyl chloride and mixtures thereof.
  • Typical of the carbonate esters which can be employed are diphenyl carbonate, a di-(halophenyl)-carbonate such as di-(chlorophenyl)carbonate, di-(bromophenyl)carbonate, di-(trichlorophenyl)carbonate, di-(tribromophenyl) carbonate, etc., di-(alkylphenyl)carbonate such as di-(tolyl)carbonate, etc., di-(naphthyl)carbonate, di-(chloronaphthyl)carbonate, etc., or mixtures thereof.
  • the suitable haloformates include bis-haloformates of dihydric phenols (bischloroformates of hydroquinone, etc.) or glycols (bishaloformates of ethylene glycol, neopentyl glycol, polyethylene glycol, etc.). While other carbonate precursors will occur to those skilled in the art, carbonyl chloride, also known as phosgene, is preferred.
  • polycarbonates Also included in the polycarbonates are the polymeric materials derived from a dihydric phenol, a dicarboxylic acid and carbonic acid. These are disclosed in U.S. 3,169,121.
  • polyetherimides can be obtained by any of the methods well known to those skilled in the art including the reaction of any aromatic bis(ether anhydrides) of the formula: where Z is as defined hereinbefore with an organic diamine of the formula: where R is as defined hereinbefore.
  • Aromatic bis(ether anhydride)s of the above formula include, for example,
  • aromatic bis(ether anhydride)s also included by the above formula are shown by Koton, M.M.; Florinski, F.S.; Bessonov, M.I.; Rudakov, A.P. (Institute of Heteroorganic Compounds, Academy of Sciences, U.S.S.R.), U.S.S.R. 257,010, Nov. 11, 1969, Appl. May 3, 1967.
  • dianhydrides are shown by M.M. Koton, F.S. Florinski, Zh Org. Khin, 4(5), 774 (1968).
  • Organic diamines of the above formula include for example, m-phenylenediamine, p-phenylenediamine, 4,4'-diaminodiphenyl propane, 4,4'-diaminodiphenylmethane, benzidine, 4,4'-diaminodiphenyl sulfide, 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl ether, 1,5-diaminoaphthalene, 3,3'-dimethylbenzidine, 3,3'-dimethoxybenzidine, 2.4-bis(p-amino-t-butyi)toiuene, bis(p-j3-amino-t-butyiphenyi)ether, 1,3-diamino-4-isopropylbenzene, 1,2-bis(3-aminopropoxy)ethane, m-xylylenediamine, p-xylenedi
  • the reactions can be advantageously carried out employing well-known solvents, e.g., o-dichlorobenzene, m-cresol/toluene, in which to effect interaction between the dianhydrides and the diamines, at temperatures of from about 100 to about 250°C.
  • the polyetherimides can be prepared by melt polymerization of any of the aforementioned dianhydrides with any of the aforementioned diamine compounds while heating the mixture of the ingredients at elevated temperatures with concurrent intermixing.
  • melt polymerization temperatures between about 200° to 400°C. and preferably 230° to 300°C. can be employed. Any order of addition of chain stoppers ordinarily employed in melt polymerization can be employed.
  • the conditions of the reaction and the proportions of ingredients can be varied widely depending on the desired molecular weight, intrinsic viscosity, and solvent resistance.
  • equimolar amounts of diamine and dianhydride are employed for high molecular weight polyetherimides, however, in certain instances, a slight molar excess (about 1 to 5 mol percent) of diamine can be employed resulting in the production of polyetherimides having terminal amine groups.
  • Generally useful polyetherimides have an intrinsic viscosity s ⁇ l greater than 0.2 deciliters per gram, preferably 0.35 to 0.60, or 0.7 deciliters per gram or even higher when measured in m-cresol at 25°C.
  • the polycarbonates of the subject blends can be manufactured by known processes, such as, for example, by reacting a dihydric phenol with a carbonate precursor such as diphenyl carbonate or phosgene in accordance with methods set forth in the above-cited literature and U.S. 4,018,750 and 4,123,436, or by transesterification processes such as are disclosed in U.S. 3,153,008, as well as other processes known to those skilled in the art.
  • the aromatic polycarbonates are typically prepared by employing a molecular weight regulator, an acid acceptor and a catalyst.
  • the molecular weight regulators which can be employed include phenol, cyclohexanol, methanol, para-tertiary-butyl-phenol, etc.
  • phenol is employed as the molecular weight regulator.
  • the acid acceptor can be either an organic or an inorganic acid acceptor.
  • a suitable organic acid acceptor is a tertiary amine and includes such materials as pyridine, triethylamine, dimethylaniline, tributylamine.
  • the inorganic acid acceptor can be one which can be either a hydroxide, a carbonate, a bicarbonate, or a phosphate of an alkali or alkali earth metal.
  • the catalysts which can be employed are those that typically aid the polymerization of the monomer with phosgene.
  • Suitable catalysts include tertiary amines such as triethylamine, tripropylamine, N,N-dimethylaniline, quaternary ammonium compounds such as, for example, tetraethylammonium bromide, cetyl triethyl ammonium bromide, tetra-n-heptylammonium iodide, tetra-n-propyl ammonium bromide, tetramethyl-ammonium chloride, tetramethyl ammonium hydroxide, tetra-n-butyl ammonium iodide, benzyltrimethyl ammonium chloride and quaternary phosphonium compounds such as, for example, n-butyltriphenyl phosphonium bromide and methyltriphenyl phosphonium bromide.
  • branched polycarbonates wherein a polyfunctional aromatic compound is reacted with the monomer and carbonate precursor to provide a thermoplastic randomly branched polycarbonate.
  • the polyfunctional aromatic compounds contain at least three functional groups which are carboxyl, carboxylic anhydride, haloformyl, or mixtures thereof.
  • Illustrative polyfunctional aromatic compounds which can be employed include trimellitic anhydride, trimellitic acid, trimellitic trichloride, 4-chloroformyl phthalic anhydride, pyromellitic acid, pyromellitic dianhydride, mellitic acid, mellitic anhydride, trimesic acid, benzophenonetetracarboxylic acid, benzophenonetetracarboxylic anhydride, and the like.
  • the preferred polyfunctional aromatic compounds are trimellitic anhydride and trimellitic acid or their acid halide derivatives.
  • blends of a polyetherimide and a polycarbonate are generally obtainable in all proportions of the polymers relative to each other.
  • the polyetherimide and carbonate components of the blend may be mixed in weight ratios of 1:99 to 99: relative to each other. It may be generally desirable to include a minimum amount of, for example, about 2%, of each of the components to achieve the desired properties for the blend.
  • blends having certain predetermined useful properties which are improved over those of certain components alone may be readily obtained.
  • blends of the subject invention may exhibit, depending on the blend ratio of the components, one or more of the properties of high tensile and/or flexural strength, good impact strength and high heat distortion temperature.
  • blends of the present invention may also include other additive materials such as fillers, stabilizers, plasticizers, flexibilizers, surfactant agents, pigments, dyes, reinforcements, flame retardants and diluents in conventional amounts. It is also contemplated that the blends of the invention may include two or more polyetherimides in combination with one or more polycarbonates or two or more polycarbonates in combination with one or more polyetherimides.
  • a preferred method comprises blending the polymers and additives such as reinforcements in powder, granular or filamentous form, extruding the blend, and chopping the extrudate into pellets suitable for molding by means conventionally used to mold normally solid thermoplastic compositions.
  • the subjects blends have application in a wide variety of physical shapes and forms, including the use as films, molding compounds, coatings, etc. When used as films or when made into molded products, these blends, including laminated products prepared therefrom, not only possess good physical properties at room temperature but they retain their strength and excellent response to workloading at elevated temperatures for long periods of time. Films formed from the blends of this invention may be used in application where films have been used previously. Thus, the blends of the present invention can be used in automobile and aviation applications for decorative and protective purposes, and as high temperature electrical insulation for motor slot liners, transformers, dielectric capacitors, cable and coil wrappings (form wound coil insulation for motors), and for containers and container linings.
  • the blends can also be used in laminated structures where films or solutions of the blend are applied to various heat-resistant or other type of materials such as asbestos, mica, glass fiber the sheets superimposed one upon the other, and thereafter subjecting the sheets to elevated temperatures and pressures to effect flow an cure of the resinous binder to yield cohesive laminated structures. Films made from the subject blends can also serve in printed circuit applications.
  • solutions of the blends herein described can be coated on electrical conductors such as copper, aluminum, and thereafter the coated conductor can be heated at elevated temperatures to remove the solvent and to effect curing of the resinuous composition thereon.
  • an additional overcoat may be applied to such insulated conductors including the use of polymeric coatings, such as polyamides, polyesters, silicones, polyvinylformal resins, epoxy resins, polyimides, polytetrafluoroethylene.
  • polymeric coatings such as polyamides, polyesters, silicones, polyvinylformal resins, epoxy resins, polyimides, polytetrafluoroethylene.
  • molding compositions and molded articles may be formed from the polymer blends of the invention by incorporating such fillers as asbestos, glass fibers, talc, quartz, powder, finely divided carbon, and silica into the blends prior to molding.
  • Shaped articles may be molded under heat, or under heat and pressure, in accordance with practices well-known in the art.
  • Polyetherimide-polycarbonate blends according to the invention were prepared and tested for various mechanical properties.
  • the polyetherimide used in preparing the blend was of the structural formula: and the polycarbonate was a commercial polycarbonate sold under the trademark Lexan by the General Electric Company, Pittsfield, Massachusetts.
  • the polyetherimide alone had the physical properties set forth in Table I.
  • the two polymers were melt blended in a weight ratio of about 95 parts polyetherimide to about 5 parts polycarbonate and the blend viscosity measured on an Instron capillary rheometer at about 300°C and a shear rate of about one sec. 02'.
  • various physical properties of the blend such as glass transition temperature (Tg), oxygen index (01), tensile strength and elongation were measured. The results of these measurements are also set forth in Table I.
  • Example I The procedure of Example I was repeated with the exception that about 90 parts of polyetherimide and about 10 parts of polycarbonate were formulated to produce the blend according to the invention.
  • the properties of the blend are set forth in Table I.
  • Example I The procedure of Example I was repeated with the exception that about 85 parts of polyetherimide and about 15 parts of polycarbonate, were formulated to produce the blend according to the invention.
  • the properties of the blend are set forth in Table I.
  • a polyetherimide-polycarbonate blend according to the invention was prepared, the blend then molded into test specimens and the specimens tested for various physical properties.
  • the polyetherimide for the blend was prepared from the reaction product of essentially equimolar amounts of 2,2-bis[4(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and m-phenylene diamine produced at elevated temperature of 250° to 300°C. and under a nitrogen atmosphere.
  • the polymer was extruded at about 300°C. to form a strand and machánically chopped into pellets. Atest specimen injection molded from the pellets had the physical properties set forth in Table II.
  • the polycarbonate used in the blend was a bisphenol A type polycarbonate sold under the trademark LEXAN 141 by the General Electric Company, Pittsfield, Massachusetts.
  • This polycarbonate prepared by reacting 2,2-bis(4-hydroxyphenyl)-propane, (bisphenol-A) and phosgene in the presence of an acid acceptor and a molecular weight regulator, has an intrinsic viscosity of about 0.57 dl/g.
  • Various physical properties of this polycarbonate are set forth in table II.
  • the polymers were mixed in a weight ratio of about 10 parts polyetherimide and about 90 parts polycarbonate and then extruded in a 28mm Werner & Pfleiderer extruder having a temperature profile varying from 299°C to 324°C.
  • the resulting extrudate was comminuted into pellets and the pellets injection molded into test specimens at a temperature of about 288°C.
  • Impact strength of the specimen was measured according to the notched and unnotched Izod test and the Gardner impact test and the results are set forth in Table II.
  • the heat distortion temperature, tensile properties and flexural properties of the blend were also measured and are set forth in Table II.
  • Example IV The procedure of Example IV was repeated with the exception that about 30 parts of polyetherimide and about 70 parts of polycarbonate, were formulated to produce the blend according to the invention and the blend was injection molded at a temperature of 302°C to 310°C to produce test specimens.
  • the results of the notched and unnotched Izod and Gardner impact tests as well as the heat distortion temperature tensile properties and flexural properties for the blend are detailed in Table II.
  • Example IV The procedure of Example IV was repeated with the exception that about 50 parts of polyetherimide and about 50 parts of polycarbonate, were formulated to produce the blend according to the invention and the blend was injection molded at about 302°C to 327°C to produce test specimens.
  • the results of the notched and unnotched Izod and Gardner impact tests, as well as the heat distortion temperature, flexural properties and molding pressure for the blend are given in Table II.
  • Example IV The procedure of Example IV was repeated with the exception that about 70 parts of polyetherimide, and about 30 parts of polycarbonate were formulated to produce the blend according to the invention and the blend was extruded at 327°C to 343°C and injection molded at about 343°C to produce test specimens.
  • the results of the notched and unnotched Izod and Gardner impact tests, as well as the heat distortion temperature, tensile properties and flexural properties for the blend are detailed in Table II.
  • Example VII The procedure of Example VII was repeated with the exception that about 90 parts of polyetherimide, and about 10 parts of polycarbonate were formulated to produce the blend according to the invention.
  • the results of the notched and unnotched Izod and Gardner impact tests, as well as the heat distortion, tensile properties and flexural properties for the blend are detailed in Table II.
  • the blends had a lower melt viscosity than the polyetherimide component alone which thereby allows the blends to be processed at a lower temperature.
  • the blends appeared to be one phase systems with no delamination or phase separation in the molded specimens although the specimens were actually a two-phase system as evidenced by two glass transition temperatures.
  • all the specimens were generally opaque in appearance.
  • some of the unnotched Izod values are not absolute values since the test specimens twisted or bent out of the path of the hammer upon impact rather than breaking and thus these values only represent impact strength values relative to the other specimens tested.
  • a polyetherimide - polyester carbonate blend according to the invention was prepared, the blend molded into test specimens, and the specimens tested for physical properties and for flame resistance.
  • the polyetherimide for the blend was prepared from the reaction product of essentially equimolar amounts of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl] propane dianhydride and m-phenylene diamine.
  • a test specimen injection molded from the polyetherimide had the physical properties and the flame characteristics as set forth in Tables III and IV.
  • the polyester carbonate was derived from bisphenol A, isophthalic acid and a carbonate precursor with a 50:50 mole ratio isophthalic acid to carbonate precursor.
  • the polyester carbonate alone had the physical properties and the flame characteristics as are set forth in Tables III and IV.
  • the two polymers were mixed in a weight ratio of about 25 parts polyetherimide and 75 parts polyester carbonate and extruded in a Werner & Pfleiderer extruder having a temperature of about 360°C.
  • the resulting extrudate was comminuted into pellets and the pellets injection molded into test specimens at a temperature of about 360°C.
  • Impact strength of a specimen was measured according to the notched Izod test, ASTM D-256, and the results are set forth in Table III.
  • the heat distortion temperature, flexural strength and flexural modulus of the blend were also measured and are given in Table III.
  • the flame resistance characteristics of the blend are set forth in Table IV as determined by the test set forth in Bulletin No. 94 of the Underwriters Laboratory (UL694).
  • Example IX The procedure of Example IX was repeated with the exception that about 50 parts of polyetherimide and about 50 parts of polyester carbonate were formulated to produce the blend according to the invention.
  • the results of the notched Izod impact test as well as the heat distortion temperature, flexural strength, and flexural modulus for the blend are detailed in Table III.
  • the flame resistance characteristics of the blend are set forth in Table IV.
  • Example IX The procedure of Example IX was repeated with the exception that about 75 parts of polyetherimide and about 25 parts of polyester carbonate were formulated to produce the blend according to the invention.
  • the results of the notched Izod impact test as well as the heat distortion temperature, flexural strength, and flexural modulus for the blend are detailed in Table III.
  • the flame resistance characteristics of the blend are set forth in Table IV.

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Claims (12)

1. Zusammensetzung, enthaltend in Abwesenheit von Polyarylat eine Mischung aus (a) 1 bis 99 Gew.- % von wenigstens einem Polycarbonat und (b) 99 bis 1 Gew.-% von wenigstens einem Polyätherimid.
2. Zusammensetzung nach Anspruch 1, worin das Polyätherimid die Formel
Figure imgb0032
aufweist, worin a eine ganze Zahl größer als 1 darstellt, die Gruppe -0-A ausgewählt ist aus:
Figure imgb0033
worin R' Wasserstoff, niederes Alkyl oder niederes Alkoxy darstellt und Z ein Glied ist aus der Klasse, bestehend aus (1)
Figure imgb0034
und (2) zweiwertigen organischen Resten der allgemeinen Formel
Figure imgb0035
worin X ein Glied ist, ausgewählt aus der Klasse, bestehend aus zweiwertigen Resten der Formeln: -CyH2y-,
Figure imgb0036
-0- und -S-worinq q O oder 1 ist, y eine ganze Zahl von 1 bis 5 ist und R ein zweiwertiger organischer Rest ist, ausgewählt aus der Klasse, bestehend aus (1) aromatischen Kohlenwasserstoffresten mit 6 bis 20 Kohlenstoffatomen und halogenierten Derivaten derselben, (2) Alkylenresten und Cycloalkylenresten mit 2 bis 20 Kohlenstoffatomen, Polydiorganosiloxanresten mit C(2-s)-Alkylenendgruppen und (3) zweiwertigen Restes, die von der Formel
Figure imgb0037
umfaßt werden, worin Q ein Glied ist, ausgewählt aus der Klasse, bestehend aus ―O―,
Figure imgb0038
―S― und ―CxH2x― worin x eine ganze Zahl von 1 bis 5 einschließlich ist.
3. Zusammensetzung nach Anspruch 2, worin das Polyätherimid die Formel:
Figure imgb0039
aufweist, und die zweiwertigen Bindungen des -O-Z-O Restes in der 3,3'; 3,4'; 4,3' oder der 4,4'-Stellung angeordnet sind.
4. Zusammensetzung nach Anspruch 3, worin Z die Formel:
Figure imgb0040
darsteilt und R ausgewählt ist, aus
Figure imgb0041
5. Zusammensetzung nach Anspruch 4, worin das Polyätherimid die Formel:
Figure imgb0042
aufweist.
6. Zusammensetzung nach den Ansprüchen 1, 2, 3, 4 oder 5, worin das Polycarbonat abgeleitet ist aus einem zweiwertigen Phenol und einem Carbonatvorläufer.
7. Zusammensetzung nach Anspruch 6, worin das zweiwertige Phenol Bisphenol-A und der Carbonatvorläufer Carbonylchlorid ist.
8. Zusammensetzung nach Anspruch 6, worin das zweiwertige Phenol Bisphenol-A und der Carbonatvorläufer Diphenylcarbonat ist.
9. Zusammensetzung nach Anspruch 6, worin das Polycarbonat wiederkehrende Struktureinheiten der Formel
Figure imgb0043
aufweist, worin Y ein zweiwertiger aromatischer Rest von:
2,2-Bis(4-hydroxyphenyl)propan,
2,2-Bis(4-hydroxy-3-methylphenyl)propan,
4,4-Bis(4-hydroxyphenyl)heptan,
2,2-Bis(3,5-dichlor-4-hydroxyphenyl)propan,
2,2-Bis(3,5-dibrom-4-hydroxyphenyl)propan, und
Bis(3-chlor-4-hydroxyphenyl)methan

ist.
10. Zusammensetzung nach Anspruch 6, worin das zweiwertige Phenol Bisphenol-A ist.
11. Zusammensetzung nach Anspruch 6, worin das Polycarbonat abgeleitet ist aus einem zweiwertigen Phenol, einer Dicarbonsäure und einem Carbonatvorläufer.
12. Zusammensetzung nach Anspruch 11, worin das Polycarbonat abgeleitet ist aus einem zweiwertigen Phenol, Isophthalsäure und einem Carbonatvorläufer.
EP83106942A 1983-07-15 1983-07-15 Polyetherimid-Polycarbonat-Mischungen Expired EP0131643B1 (de)

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DE8383106942T DE3375694D1 (en) 1983-07-15 1983-07-15 Polyetherimide-polycarbonate blends
EP83106942A EP0131643B1 (de) 1983-07-15 1983-07-15 Polyetherimid-Polycarbonat-Mischungen

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EP0131643B1 true EP0131643B1 (de) 1988-02-17

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673708A (en) * 1984-12-28 1987-06-16 General Electric Company Impact modified polyetherimide-polycarbonate blends
US4629759A (en) * 1985-10-28 1986-12-16 General Electric Company Flame retardant polyetherimide-polycarbonate blends
US5051483A (en) * 1988-11-14 1991-09-24 General Electric Company Flame resistant polyetherimide resin blends
US7649040B2 (en) 2002-04-11 2010-01-19 Sabic Innovative Plastics Ip B.V. Flame retardant fiber reinforced composition with improved flow

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117327A1 (de) * 1983-02-25 1984-09-05 General Electric Company Ternäre Polymermischungen

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Publication number Priority date Publication date Assignee Title
US3489696A (en) * 1966-10-06 1970-01-13 Mobay Chemical Corp Process of preparing polyimides from isocyanates and polycarboxylic acids
US4225687A (en) * 1979-07-23 1980-09-30 General Electric Company Novel halobisphenolethylene polycarbonate-polyetheramide-imide blends

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117327A1 (de) * 1983-02-25 1984-09-05 General Electric Company Ternäre Polymermischungen

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